WIP: 3D graphs

[dk-]

Figured I'd share a picture of some work-in-progress code.

Is there already a solution for 3D graphs done for the DM42 or should I keep digging this hole?

[rprosperi]

There are several other solutions, but none of them are general purpose, and as far as I've seen, have not been widely adopted.

I'd say - Grab a shovel and go...

[dk-]

My current solution can be made fairly general purpose since it uses affine transformations to setup a view port with perspective. But instead it's fairly slow...so it might be a bit too slow when running on battery.